Hi shiney66
This one cost me about A$600 or so to put together, with a lot of scrounging for cheap stuff and making my own stuff when I could. It was also when the Aussie dollar was about 0.78 US, so it would be more like $700-800 right now and even more at the NZ rate. Still a very cheap CNC router though.
Yes you could probably get all the frame stuff from Bunnings (special order 25mm MDF).
My electronics are hobbyCNC, you can find them on the web - I have the pro board and 305 oz/in steppers. Can't get them here for the price even with a crappy exchange rate.